# [prefix_]getEntryIdXPath

Use this function to return XPath referencing the ID for the entry. This ID is used as the reference for the document. Either this function or `getEntryId` must result in a valid reference. The function is not called if `getEntryId` has already returned a valid reference.

Inputs: | xml (XmlDocument), document (Document)
Outputs: | xpath (string)
See also: | [prefix_]getEntryId

## Example

    function myPrefix_getEntryIdXPath(xml, document)
       cache_result()
       return "~/atom:id"
    end

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